30. Which of the following daily activity shows changes in properties of materials?
A. A dog biting its bone toy.
B. Dad spilled his coffee
. C. Mom cooks pancake.
D. All of the above.
30. What will happen if waste materials are not properly disposed?
A. It can be a source of humus. B. It can help wastes to decay faster. C. It allows free flow of rainwater run off. D. It can cause air, land, and water pollution.
31. What are the ways to keep our surroundings clean and prevent or minimize pollution in our environment?
A. People are encouraged to do the 5R's (Reduce, Reuse, Recycle, Repair and Rot)
B. Burn garbage such as plastic materials, rubber, and other waste.
C. Throw wastes into the sewage or river.
D. None of the above.
32. What is the effect of burning old tires and plastic materials?
A. It can help prevent diseases.
B. It can help us breathe easily.
C. It can pollute the air.
D. None of the above. _
33. What will happen if you will bury decaying materials in the soil?
A. It loosens the soil.
B. It pollutes the soil.
C. It enriches the soil with nutrients.
D. It removes the soil. _
34. What will happen if you will bury non-decaying materials in the soil?
A. It pollutes the soil
B. It can help plants grow faster
C. It provides nutrients to the soil
D. It can be a best source of humus
35. What is the harmful effect of cutting down trees?
A. It affects the air that we breathe
B. It provides habitat to animals
C. It produces more oxygen
D. None of the above
36. What will you do with the plastic bags found in your house? A. throw it everywhere B. reuse it C. burn it D. bury it
Share
30. C
30. D
31. A
32. C
33. C
34. A
35. A
36. B
Explanation:
Hope it helps :>
Answer:
30.C
30.C
31. A
32.C
33.B
34.A
35.C
36.B
Explanation:
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